Exam 3: Ecosystems: What Are They and How Do They Work

____________________ can help scientists understand large and very complex systems by allowing them to change variables and project possible changes.

(Short Answer)

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Question 61

Which consumers feed on the flesh of herbivores?

(Multiple Choice)

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Question 62

Nutrient cycles connect past, present, and future forms of life.

(True/False)

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Question 63

The typical percentage of high quality energy loss in transfers from one trophic level to the next is about ____.

(Multiple Choice)

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Question 64

What is a result of phosphate rich runoff from land?

(Multiple Choice)

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Question 65

Carbon is a major component of ____.

(Multiple Choice)

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Question 66

In hundreds of years, we have released large quantities of fossil fuels that took millions of years to form.

(True/False)

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Question 67

How much of the earth's water supply is available as accessible liquid freshwater?

(Multiple Choice)

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Question 68

Vitousek, Rojstaczer, and others estimate humans now use, waste, or destroy what percentage of the earth's total potential NPP?

(Multiple Choice)

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Question 69

Tropical rain forests may be prevented from returning to cleared areas if an irreversible ______________ is reached.

(Short Answer)

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Question 70

Humans add sulfur to the atmosphere primarily by the release of ____.

(Multiple Choice)

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Question 71

Use the accompanying figure to answer the following question(s). What group is indicated by letter E, to which all organisms in the pyramid eventually succumb?

(Short Answer)

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Question 72

Complex networks of interconnected food chains are ____.

(Multiple Choice)

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Question 73

Transfer of energy through food chains or webs is very efficient, making a lot of energy available to organisms.

(True/False)

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Question 74

The reason we observe a "pyramid" of energy flow instead of an energy flow "cube" is because the low ecological efficiency of biological systems limits the numbers of organism in the higher trophic levels.

(True/False)

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Question 75

Organisms that cannot produce their own food and, therefore, must eat other organisms, are called ____________________.

(Short Answer)

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Question 76

What is the term for the portion of the earth's atmosphere, hydrosphere, and geosphere where life is found?

(Multiple Choice)

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Question 77

The hydrologic cycle is the movement of ____.

(Multiple Choice)

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Question 78

Consider the concept of trophic levels, and explain why it may be necessary for humans to eat less meat. How much energy is lost from one level to the next? Use numbers to support your argument.

(Essay)

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Question 79

Nitrogen fixation is accomplished by specialized in the soil and in aquatic environments.

(Short Answer)

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Question 80

Showing 61 - 80 of 90

____________________ can help scientists understand large and very complex systems by allowing them to change variables and project possible changes.

Which consumers feed on the flesh of herbivores?

Nutrient cycles connect past, present, and future forms of life.

The typical percentage of high quality energy loss in transfers from one trophic level to the next is about ____.

What is a result of phosphate rich runoff from land?

Carbon is a major component of ____.

In hundreds of years, we have released large quantities of fossil fuels that took millions of years to form.

How much of the earth's water supply is available as accessible liquid freshwater?

Vitousek, Rojstaczer, and others estimate humans now use, waste, or destroy what percentage of the earth's total potential NPP?

Tropical rain forests may be prevented from returning to cleared areas if an irreversible ______________ is reached.

Humans add sulfur to the atmosphere primarily by the release of ____.

Use the accompanying figure to answer the following question(s). What group is indicated by letter E, to which all organisms in the pyramid eventually succumb?

Complex networks of interconnected food chains are ____.

Transfer of energy through food chains or webs is very efficient, making a lot of energy available to organisms.

The reason we observe a "pyramid" of energy flow instead of an energy flow "cube" is because the low ecological efficiency of biological systems limits the numbers of organism in the higher trophic levels.

Organisms that cannot produce their own food and, therefore, must eat other organisms, are called ____________________.

What is the term for the portion of the earth's atmosphere, hydrosphere, and geosphere where life is found?

The hydrologic cycle is the movement of ____.

Consider the concept of trophic levels, and explain why it may be necessary for humans to eat less meat. How much energy is lost from one level to the next? Use numbers to support your argument.

Nitrogen fixation is accomplished by specialized in the soil and in aquatic environments.

Environmental Problems, Their Causes, and Sustainability

Science, Matter, Energy, and Systems

Biodiversity and Evolution

Biodiversity, Species Interactions, and Population Control

The Human Population and Its Impact

Climate and Biodiversity

Aquatic Biodiversity

Sustaining Biodiversity: The Species Approach

Sustaining Terrestrial Biodiversity: The Ecosystem Approach

Sustaining Aquatic Biodiversity

Filters

Exam 3: Ecosystems: What Are They and How Do They Work

____________________ can help scientists understand large and very complex systems by allowing them to change variables and project possible changes.

Which consumers feed on the flesh of herbivores?

Nutrient cycles connect past, present, and future forms of life.

The typical percentage of high quality energy loss in transfers from one trophic level to the next is about ____.

What is a result of phosphate rich runoff from land?

Carbon is a major component of ____.

In hundreds of years, we have released large quantities of fossil fuels that took millions of years to form.

How much of the earth's water supply is available as accessible liquid freshwater?

Vitousek, Rojstaczer, and others estimate humans now use, waste, or destroy what percentage of the earth's total potential NPP?

Tropical rain forests may be prevented from returning to cleared areas if an irreversible ______________ is reached.

Humans add sulfur to the atmosphere primarily by the release of ____.

Use the accompanying figure to answer the following question(s). What group is indicated by letter E, to which all organisms in the pyramid eventually succumb?

Complex networks of interconnected food chains are ____.

Transfer of energy through food chains or webs is very efficient, making a lot of energy available to organisms.

The reason we observe a "pyramid" of energy flow instead of an energy flow "cube" is because the low ecological efficiency of biological systems limits the numbers of organism in the higher trophic levels.

Organisms that cannot produce their own food and, therefore, must eat other organisms, are called ____________________.

What is the term for the portion of the earth's atmosphere, hydrosphere, and geosphere where life is found?

The hydrologic cycle is the movement of ____.

Consider the concept of trophic levels, and explain why it may be necessary for humans to eat less meat. How much energy is lost from one level to the next? Use numbers to support your argument.

Nitrogen fixation is accomplished by specialized ____________________ in the soil and ____________________ in aquatic environments.

Environmental Problems, Their Causes, and Sustainability

Science, Matter, Energy, and Systems

Biodiversity and Evolution

Biodiversity, Species Interactions, and Population Control

The Human Population and Its Impact

Climate and Biodiversity

Aquatic Biodiversity

Sustaining Biodiversity: The Species Approach

Sustaining Terrestrial Biodiversity: The Ecosystem Approach

Sustaining Aquatic Biodiversity

Filters

Nitrogen fixation is accomplished by specialized in the soil and in aquatic environments.